001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.juneau.rest.client.apachehttpclient45;
018
019import org.apache.juneau.rest.client.*;
020
021/**
022 * {@link HttpTransportProvider} implementation that supplies an {@link ApacheHc45Transport}.
023 *
024 * <p>
025 * Registered via {@code META-INF/services/org.apache.juneau.rest.client.HttpTransportProvider} so that
026 * {@code RestClient} can auto-discover Apache HttpClient 4.5 when this module is on the classpath.
027 *
028 * <h5 class='section'>See Also:</h5><ul>
029 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/NextGenRestClient">Next-Generation REST Client</a>
030 * </ul>
031 *
032 * @since 9.2.1
033 */
034@SuppressWarnings({
035   "resource" // Provider methods return Closeables owned by the caller; Eclipse JDT @Owning warning is by design.
036})
037public final class ApacheHc45TransportProvider implements HttpTransportProvider {
038
039   @Override /* HttpTransportProvider */
040   public int getPriority() {
041      return 50;
042   }
043
044   @Override /* HttpTransportProvider */
045   public boolean isAvailable() {
046      try {
047         Class.forName("org.apache.http.impl.client.CloseableHttpClient");
048         return true;
049      } catch (ClassNotFoundException e) {  // HTT: HttpClient 4.5 is a compile-time dependency of this module, so it is always on the test classpath
050         return false;  // HTT: unreachable while this module's own dependency is present
051      }
052   }
053
054   @Override /* HttpTransportProvider */
055   public HttpTransport create() {
056      return ApacheHc45Transport.create();
057   }
058}